2145880 has 32 divisors (see below), whose sum is σ = 5268240. Its totient is φ = 780160.

The previous prime is 2145853. The next prime is 2145937. The reversal of 2145880 is 885412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1999 + ... + 2878.

2^2145880 is an apocalyptic number.

2145880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2145880 is an abundant number, since it is smaller than the sum of its proper divisors (3122360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2145880 is a wasteful number, since it uses less digits than its factorization.

2145880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4899 (or 4895 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 2145880 is about 1464.8822478274. The cubic root of 2145880 is about 128.9837930083.

It can be divided in two parts, 2145 and 880, that added together give a square (3025 = 55²).

The spelling of 2145880 in words is "two million, one hundred forty-five thousand, eight hundred eighty".